US5028173A - Apparatus for the floatable guiding of webs of material by air blown against the web - Google Patents

Apparatus for the floatable guiding of webs of material by air blown against the web Download PDF

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Publication number
US5028173A
US5028173A US07/472,892 US47289290A US5028173A US 5028173 A US5028173 A US 5028173A US 47289290 A US47289290 A US 47289290A US 5028173 A US5028173 A US 5028173A
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US
United States
Prior art keywords
blowing
web
apertures
acute angle
boxes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/472,892
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English (en)
Inventor
Hilmar Vits
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Contiweb BV
Original Assignee
Individual
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Publication date
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Publication of US5028173A publication Critical patent/US5028173A/en
Assigned to STORK CONTIWEB B.V. reassignment STORK CONTIWEB B.V. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: VITS, HILMAR
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
    • F26B13/101—Supporting materials without tension, e.g. on or between foraminous belts
    • F26B13/104—Supporting materials without tension, e.g. on or between foraminous belts supported by fluid jets only; Fluid blowing arrangements for flotation dryers, e.g. coanda nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C31/00—Handling, e.g. feeding of the material to be shaped, storage of plastics material before moulding; Automation, i.e. automated handling lines in plastics processing plants, e.g. using manipulators or robots
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/24—Registering, tensioning, smoothing or guiding webs longitudinally by fluid action, e.g. to retard the running web
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
    • B29C35/045—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using gas or flames
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2406/00—Means using fluid
    • B65H2406/10—Means using fluid made only for exhausting gaseous medium
    • B65H2406/11—Means using fluid made only for exhausting gaseous medium producing fluidised bed
    • B65H2406/112—Means using fluid made only for exhausting gaseous medium producing fluidised bed for handling material along preferably rectilinear path, e.g. nozzle bed for web

Definitions

  • the nozzles comprise a blowing box formed with two opposite blowing slots or rows of blowing apertures, from which air is blown at an acute angle against the web of material.
  • the blown air forms between the blowing slots, a plate disposed therebetween and a web of material, an air-cushion which supports the web of material.
  • blowing boxes are disposed above and below the web of material and are offset in relation to one another in the direction in which the web travels. In this arrangement the web of material is guided undulatingly.
  • Such undulating guiding is formed only with limited tensioning of the web and is desirable to reduce or prevent edge flapping, in order to ensure guiding with reliable contact.
  • the blowing box is contructed asymmetrically--i.e., the blowing direction of the blowing apertures disposed at one edge is steeper than that of the blowing apertures at the other edge.
  • blowing box favours a flow-off from the air-cushion between the two longitudinal edges always via the edge having the more steeply adjusted blowing jets.
  • a flow off from the air-cushion in the longitudinal direction can also be reduced by blowing agent emerging via a perforation in a cover disposed between the blowing apertures.
  • the opposite blowing apertures are offset in relation to one another by half the pitch (distance between the blowing apertures).
  • the blown air from the blowing apertures impinges on the web of material at a shallow angle of about 30°.
  • the distance between the blowing apertures is so selected that the blown air jets emerging from opposite blowing apertures touch one another only slightly at a tangent at the edge, but substantially flow past one another. It is true that in this way a clearly-defined flow-off of the blown air is achieved via the longitudinal edges of the blowing box without any flow-off in the longitudinal direction thereof, but it is impossible for strong air-cushions to form. If the apparatus is used for drying, heat transfer and therefore drying performance are low, due to the shallow angle at which the blowing jets impinge on the web of material (U.S. Pat. No. 3 837 551).
  • the invention relates to an apparatus for the floatable guiding of webs by air blown against the web, comprising a number of blowing boxes which are disposed transversely of the direction of travel of the web on one or both sides and are offset in relation to one another, more particularly in the direction of travel, and each of which has on the side adjacent the web of material two rows of opposite blowing apertures offset in relation to one another by half a pitch with an interposed cover, whose edges remote from the web of material are each adjoined by a deflecting surface merging into the cover and whose blowing directions each have a component directed against the web of material and a component directed against the blowing apertures in the other row, the blown air flowing off between the blowing apertures of each row.
  • the deflecting surfaces enclose an acute angle with the blowing direction of each blowing aperture on the one hand and an acute angle with the web of material on the other, such that the blown air is deflected away from the deflecting surface and so steeply against the web of material that the air impinging on the web spreads out in all directions after the fashion of a source flow.
  • the web of material is satisfactorily guided with reliable contact if the blowing direction encloses an acute angle between 15° and 45°, more particularly 30°, with the web of material.
  • the acute angle between the deflecting surface and the blowing direction is 15° to 45°, more particularly 30°, while the acute angle between the deflecting surface and the web of material is 40° to 80°, more particularly 60°.
  • blowing apertures have a rectangular cross-section, their outer longitudinal side being bounded by a flank of the blowing box and their inner longitudinal side being bounded by the deflecting surface.
  • the distances between the blowing apertures of a row are 35% to 65%, more particularly 50%, of the distances between the blowing apertures of the two opposite rows of a blowing box.
  • the blowing box can be very simply constructed, in that the deflecting surfaces are formed by the downwardly bent edges of a substantially flat depression cover which is inserted in a depression of the blowing box, formed between the blowing apertures and having a bottom, and is attached to said bottom of the depression via tongues which are formed at the edges, extend through the blowing apertures and engage behind the bottom of the depression.
  • FIG. 1 shows in cross-section a detail of an apparatus for the floatable guiding of webs of material by means of air
  • FIG. 2 is a plan view of a blowing box of the apparatus shown in FIG. 1.
  • An apparatus for the floatable guiding of a web of material by air comprises blowing boxes 2, 3, 4 disposed below a web 1 of material and blowing boxes 5, 6 disposed thereabove. All the blowing boxes 2-6 are identically constructed and are disposed transversely of the direction of travel of the web 1 of material, the lower blowing boxes 2-4 being offset in relation to the upper blowing boxes 5, 6 by half a pitch (the distance of the planes of symmetry of the blowing boxes in the direction of web travel).
  • Each blowing box 2 comprises a box bottom 7, two side walls 8, 9, whose upper zones adjacent the web 1 of material form inclined flanks 10, 11 directed towards one another, and a depression 12 disposed between the flanks 10, 11 and having a bottom 13.
  • the edges of the flanks 10, 11 are connected to the bottom 13 of the depression via webs 14, 15 formed with blowing apertures 16-22 taking the form of elongate rectangular slots.
  • a substantially flat depression cover 24 Disposed in the depression 12 and in the plane of the edges of the flanks 10, 11 is a substantially flat depression cover 24, whose edges are bent down in the direction of the side remote from the web of material and form deflecting surfaces 25, 26.
  • tongues 27, 28 Disposed at the edges of the deflecting surfaces 25, 26 are tongues 27, 28 which engage through the blowing apertures 16-22 and behind the bottom 13 of the depression.
  • the depression cover 24 with the deflecting surfaces 25, 26 is fixed in the depression 12 in this manner.
  • the blowing apertures 16-22 form a right angle with the adjoining flank 10, 11.
  • the blowing direction B of each blowing aperture 16-22 extends parallel with the adjacent flank 10, 11 acting as a guide surface and encloses an acute angle a2 of 15° to 45°, more particularly 30°, with the associated deflecting surface 25, 26.
  • the blowing direction B encloses an angle al of 15° to 45°, more particularly 30°, with the web 1 of material.
  • Each deflecting surface 25, 26 encloses an angle a3 of 45° to 80°, more particularly 60°, with the web 1 of the material and the depression cover 54 disposed in parallel therewith respectively.
  • the blowing box Due to the special construction of the blowing box, the blown air emerging from the blowing apertures 16-22 impinges on the deflecting surfaces 25, 26, which deflect the air in the direction of the web 1 of material, the width of the blown jet increasing. The deflection is boosted by the air-cushion, so that then the blown air impinges substantially perpendicularly on the web 1 of material and spreads out thereon after the fashion of a source flow 30 in all directions, as shown in FIG. 2 in the case of the blown air blown from the blowing aperture 21. Due to the elongate construction of the blowing apertures 16-22, two main jet directions are formed perpendicularly to the longitudinal axis of the blowing box. An air-cushion with sharply contoured edges 31 and flow-off channels 32 therebetween is produced in association with each blowing aperture 16-22.
  • the invention ensures that the web 1 of material is borne on strong air-cushions with a clearly-defined flow-off of the air from the cushions, the source flow 30 producing a high heat transfer at the web 1 of material.
  • the stable position of the web 1 of material no longer depends on undulating guiding, so that thinner webs of material can be reliably guided with high tensile stress and an enhanced drying performance is achieved, something which has a positive effect on the possible maximum speed of the web.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Robotics (AREA)
  • Advancing Webs (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Drying Of Solid Materials (AREA)
US07/472,892 1989-02-17 1990-01-31 Apparatus for the floatable guiding of webs of material by air blown against the web Expired - Fee Related US5028173A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3904774 1989-02-17
DE3904774A DE3904774C1 (enExample) 1989-02-17 1989-02-17

Publications (1)

Publication Number Publication Date
US5028173A true US5028173A (en) 1991-07-02

Family

ID=6374282

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/472,892 Expired - Fee Related US5028173A (en) 1989-02-17 1990-01-31 Apparatus for the floatable guiding of webs of material by air blown against the web

Country Status (5)

Country Link
US (1) US5028173A (enExample)
EP (1) EP0383037B1 (enExample)
JP (1) JP2859355B2 (enExample)
AT (1) ATE98603T1 (enExample)
DE (2) DE3904774C1 (enExample)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5222726A (en) * 1988-04-02 1993-06-29 Hilmar Vits Process and device for suspended conveying of material in sheets or bands over a conveying path, in particular a curved conveying path
US5471766A (en) * 1993-03-18 1995-12-05 Valmet Paper Machinery, Inc. Method in contact-free air-drying of a material web as well as a nozzle-blow-box and a pulp dryer that make use of the method
US5557861A (en) * 1993-06-30 1996-09-24 Materiels Equipements Graphiques, S.A. Device for drying a material in strip form, in particular paper in strip form
US5951006A (en) * 1998-05-22 1999-09-14 Xerox Corporation Modular air jet array with coanda exhausting for module decoupling

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10256512A1 (de) * 2002-05-07 2003-11-20 Voith Paper Patent Gmbh Einrichtung zur Führung einer laufenden Papier-, Karton-, oder anderen Faserstoffbahn
DE10335581A1 (de) * 2003-07-31 2005-02-24 Voith Paper Patent Gmbh Vorrichtung zur Führung und Trocknung einer laufenden Faserstoffbahn
CN102070039B (zh) * 2010-11-29 2013-05-22 苏州中门子科技有限公司 气垫悬浮传送带材的纠偏装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4197971A (en) * 1978-10-12 1980-04-15 W. R. Grace & Co. High velocity web floating air bar having an internal passage for transverse air discharge slot means
US4290210A (en) * 1978-12-06 1981-09-22 Ab Svenska Flaktfabriken Device for drying web material
US4384666A (en) * 1980-03-28 1983-05-24 Valmet Oy Nozzle apparatus for handling web material
US4414757A (en) * 1981-10-07 1983-11-15 Overly, Incorporated Web dryer nozzle assembly
US4836429A (en) * 1986-07-17 1989-06-06 Fuji Photo Film Co., Ltd. Method and apparatus of non-contact conveyance of a web
US4837947A (en) * 1986-07-31 1989-06-13 Kurt Krieger Device for acting upon webs of material with a flowing medium
US4854052A (en) * 1986-03-14 1989-08-08 Valmet Oy Floater radiation dryer

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1395604A (fr) * 1963-12-17 1965-04-16 Appareillage et procédé pour le guidage d'une bande continue
US3837551A (en) * 1972-06-19 1974-09-24 Midland Ross Corp Web conveying and treating method and apparatus
US3982327A (en) * 1975-05-01 1976-09-28 Midland-Ross Corporation Air-dispensing web-floating apparatus
DE2613135C3 (de) * 1976-03-27 1978-11-23 Vits-Maschinenbau Gmbh, 4018 Langenfeld Luftkissendüse
DE3130450C2 (de) * 1981-07-23 1985-06-13 Langbein & Engelbracht GmbH & Co, KG Bau lufttechnischer Anlagen, 4630 Bochum Vorrichtung zum Trocknen von bahn- oder bogenförmigem Gut
US4718178A (en) * 1985-11-29 1988-01-12 Whipple Rodger E Gas nozzle assembly

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4197971A (en) * 1978-10-12 1980-04-15 W. R. Grace & Co. High velocity web floating air bar having an internal passage for transverse air discharge slot means
US4290210A (en) * 1978-12-06 1981-09-22 Ab Svenska Flaktfabriken Device for drying web material
US4384666A (en) * 1980-03-28 1983-05-24 Valmet Oy Nozzle apparatus for handling web material
US4414757A (en) * 1981-10-07 1983-11-15 Overly, Incorporated Web dryer nozzle assembly
US4854052A (en) * 1986-03-14 1989-08-08 Valmet Oy Floater radiation dryer
US4836429A (en) * 1986-07-17 1989-06-06 Fuji Photo Film Co., Ltd. Method and apparatus of non-contact conveyance of a web
US4837947A (en) * 1986-07-31 1989-06-13 Kurt Krieger Device for acting upon webs of material with a flowing medium

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5222726A (en) * 1988-04-02 1993-06-29 Hilmar Vits Process and device for suspended conveying of material in sheets or bands over a conveying path, in particular a curved conveying path
US5471766A (en) * 1993-03-18 1995-12-05 Valmet Paper Machinery, Inc. Method in contact-free air-drying of a material web as well as a nozzle-blow-box and a pulp dryer that make use of the method
US5557861A (en) * 1993-06-30 1996-09-24 Materiels Equipements Graphiques, S.A. Device for drying a material in strip form, in particular paper in strip form
US5951006A (en) * 1998-05-22 1999-09-14 Xerox Corporation Modular air jet array with coanda exhausting for module decoupling

Also Published As

Publication number Publication date
EP0383037A3 (de) 1991-04-10
JPH02261757A (ja) 1990-10-24
ATE98603T1 (de) 1994-01-15
EP0383037A2 (de) 1990-08-22
JP2859355B2 (ja) 1999-02-17
EP0383037B1 (de) 1993-12-15
DE3904774C1 (enExample) 1990-05-17
DE59003816D1 (de) 1994-01-27

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AS Assignment

Owner name: STORK CONTIWEB B.V.

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:VITS, HILMAR;REEL/FRAME:005974/0451

Effective date: 19911021

FPAY Fee payment

Year of fee payment: 4

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
FP Lapsed due to failure to pay maintenance fee

Effective date: 19990702

STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362